Elevator.



U. A. STURM.

ELEVATOR.

' APPLICATION I'ILED MAR. 24, 1911.

,028,798. Patented June-4, 1912.

v 2 SHBETS-SHEET l.

0. A. STURM.

ELEVATOR.

APPLICATION FILED MAR. 24, 1911.

1,028,798, I Patented June" 4, 1912.

2 SHEETS-SHEET 2.

avwan to witnesses Warp V I I Gumm CHARLES A. STURM, OF PORTLAND, OREGON.

ELEVATOR.

Specification of Letters Patent.

Patented June 4, 1912.

Application filed March 24, 1911. Serial No. 616,749.

To all whom it may con corn:

Be it known that I, CHARnas A. STURM, a citizen of the United States, residing at Portland, in the county of Multnomah and State of Oregon, have invented certain new and useful Improvements in Elevators, of

which the following is a specification.

My invention relates to an elevator or dumbwaiter of the type commonly used in apartment houses, hotels or stores, and which is operated from a point outside the elevator cage, generally the basement of the building which it supplies.

The object of my invention is to provide means in an elevator mechanism of this type, and in which a plurality of elevators may be operated to rise and descend from a single power unit, for controlling the starting of each elevator from a point in close proximity to the elevator well,-to enable the operator to stay with the elevator he is serv- A further object is to provide a selective stopping mechanism, by means ofwhich the operator can set the elevator to stop at any floor simultaneously with his starting the elevator, by simply throwing a hand lever.

The objects of my invention are clearly set forth in the following description and in the appended drawings, in which:

Figure 1 illustrates, in side elevation, a dumbwaiter mechanism embodying my invention, Fig. 2 is a front elevation of part of Fig. 1, showing the relation of the dumbwaiter cage to a fioor stop, Fig. 3 is an enlarged side elevation of the operating mechanism, Fig. 4 is a sectional rear end elevation taken on a line A A of Fig. 8, Fig. 5 illustrates a modified form of a centrifugal speed controlling means, Fig. 6 is an enlarged detail view of the starting lever shown in Fig. 1 and Fig. 7 illustrates, on a larger scale, the selective stopping, levers shown in Fig. 2.

The side wall a and ceilings or floors b, 0 represent the parts of a building to which the dumbwaiter mechanism is attached. Dumbwaiter cage (Z is suspended from a cable 6 which runs over pulleys f, g, to a cable drum h, loosely hung on a crank shaft 2' and integral with pulley Crank shaft 2' journals in bearings 7c of a frame Z, in which is also journaled a driving pulley m, to which motive power is applied in any suitable manner. To one end of the crankshaft is fixed an arm 1%, adapted to oscillate said crankshaft, and to force pulley j against driving pulley m or brake shoe 0, rigidly affixed to frame Z. To insure greater adherence, the pulleys and the brake shoe are provided with a covering of leather or other friction producing material.

A coilspring p suspended between arm n and the frame tends to hold pulley jagainst brake shoe 0, and a cable attached to arm 71., runs over pulleys g, r to starting lever s,

which issecured by a stud t, to a segmental frame a, mounted on the side i) of the elevator well.

In Fig. 1 the driving pulley m, is shown positioned between two friction pulleys j. When the dumbwaiter is at rest, pulley is held against brake shoe 0 as shown on the right side of the figure. To start the dumbwaiter, lever s is depressed, throwing the pulley 3' against the driving pulley as shown to the left in the figure. To starting lever s is pivoted a bell crank w, pro vided with a shoulder 00 abutting the curved surface 3 of segment a, and a rod 2 connects said bell crank with a finger piece 2 pivoted on handle 3 of the starting lever. To depress the starting lever, the operator grips finger piece 2 and handle 3, compresses spring 4 and causes shoulder 00 to release its hold on surface y of the seg ment. He depresses the starting lever, and the moment he lets go of it, shoulder 00 is again, by spring 4:, forced against surface y, and holds the lever depressed.

On the outer end of bellcrank w is hinged a pendent rod 6, attached by a strong spring 7 to the floor (or sidewall) on which the mechanism rests, and from the upper end of the rod extends a cable 7*, secured to the top ceiling 5, near which the cable is provided with a spring 8, strong enough to keep the cable taut.

A pluralityof arms 9, 10 are pivoted on side wall 42 by studs 11, and on the arms are hinged stoplevers 12, made with projecting stops 13, 15. Cable 7 passes over said stop levers 12, and is fastened to them in any suitable manner at 14- To the outside of side wall 1) is journaled a shaft 16 in bearings 17, and on this shaft are loosely hung a plurality of hand levers '18, 19, there being one hand lever for each floor stop, and the handlevers are provided with arms 20, 21, which project through an aperture 22 of the side wall and serve as terminals for cables 23, 24, which extend upward over pulleys 25, 26, thence horizontally across arms 9, 10, to which they are fastened, and from which extend in continuation springs 27 28 attached to the side Wall.

The dumbwaiter cage (Z is provided on the top with a hinged stop 29 and on the bottom with a fixed stop 30, which registers with a stop projection 31 of a lever 32, pivoted on wall 1; by a stud 33, its other end being attached to rod 6. Handle-vers 18, 19 are made with projections 60 adapted to ride on yielding guides 61, so that they will normally stay in position and still readily be shifted by hand or by the stops on the cage.

As described, starting lever s is depressed and cage d is traveling upward. By referring to Fig. 1 it is also noted that handlever 18 is raised, causing a corresponding depression of its arm 20, which through cable 23, has pulled stop 15 into the pat-h of travel (indicated by dotted line 35) of cage stop 29. The latter, therefore, strikes said stop 15, and by cable 7" swings bell crank w, releasing starting lever s, and permitting spring p to pull friction pulley 7' against brake shoe 0, whereby the dumbwaiter comes to a stop.

To return the cage to the bottom, it is only necessary to depress starting lever s sufficiently to release pulley 7' from the brake shoe, and the cage drops by its own gravity. If, in starting the elevator to return the cage from its highest position, the operator accidentally raises handlever 19, then stop 13, through cable 24 is thrown into the path of cage stop 29. But as said stop 29 is hinged on the cage, as mentioned above and shown in Figs. 1 and 2, it swings clear of stop 13, and the descent of the cage continues until fixed stop 30 of the cage strikes projection 31 of lever 32, whereupon the latter releases starting lever s, and the cage comes to a stop as already described. It is necessary, however, to govern the speed of the dumbwaiter in descending, and this I accomplish in the following manner. A spoke 40 of pulley 7' has an elongated perforation in which is slidingly pivoted a lever 41, provided with a friction shoe 42,

and made with projecting arm 43, provided with a weight 44. A coil spring 45, suspended between arm 43 andrspoke 46 of pulley j, draws friction shoe 42 away from the inner periphery 46 of a pulley 47 rigid on crank shaft 2'. As the dumbwaiter cage, in dropping, increases its speed, the centrifugal force causes weight 44 to draw lever 41 outward until friction shoe 42 touches the inner periphery 46 of pulley 47 and effectively checks the speed of the dumbwaiter.

In Fig. 5 I show a modification of said speed governor, in that the friction shoe 50 is adapted to engage the outside peripheral controlled by the levers mounted in the elevator well, the driving mechanism may be located at any convenient place, irrespective of the location of the dumbwaiter.

I claim:

1. The combination of an elevator hoisting mechanism with an automatic control system comprising: an elevator cage operatively connected with said hoisting mechanism, a fixed projection on said cage. a pivoted projection on said cage, a segmental support, a controlling lever, said lever being pivoted on said segmental support operatively connected with said hoisting mechanism and normally locked in place, means for releasing said controlling lever, a series of selective stops operatively connected with said controlling lever and adapted to engage the pivoted cage projection, means for drawing said stops into the path of said pivoted cage projection, and a pivotally fixed stop in the path of said fixed cage projection, by means of which the extreme motion of the cage is limited.

2. The combination of an elevator hoisting mechanism with an automatic control system comprising: an elevator cage 0peratively connected with said hoisting mechanism, a fixed projection on said cage, a pivoted projection on the cage, a segmental support, a controlling lever, said lever being pivoted on said segmental support and operatively connected with said hoisting mechanism, a spring-held bell-crank pivoted on said controlling lever, said bell-crank having a shoulder normally engaging said sup port to lock said lever in place, a fingerpiece pivoted on said controlling lever operatively connected wit-h said bell-crank to release said lever from said support, a series of selective stops operatively connected with said controlling lever and adapted to engage the pivoted cage projection, means for drawing said stops into the path of said pivoted cage projection, and a pivotally fixed stop in the path of said fixed cage projection by means of which the extreme motion of the cage is limited. 7

3. The combination of an elevator hoisting mechanism with an automatic control system comprising: an elevator cage operatively connected with said hoisting mechatrolling nism, a fixed projection on said cage, a pivoted projection on the cage, a segmental support, a controlling lever pivoted on said segmental support, said lever operatively connected with said hoisting mechanism, a spring-held bell-crank pivoted on said conlever, said bell-crank having a shoulder normally engaging said support to lock the lever in place, a finger-piece pivoted on said controlling lever operatively connected with said bell-crank to release said lever from said support, a series of selective stops operatively connected with said bellcrank, means for drawing said stops into the path of said pivoted cage projection, and a pivotally fixed stop in the path of said fixed cage projection, by means of which the extreme mot-ion of the cage is limited.

4:. The combination of an elevator hoisting mechanism with an automatic control system comprising: an elevator cage operatively connected with said hoisting mechanism, a fixed projection on said cage, a pivoted projection on the cage, a segmental support, a controlling lever, said lever being pivoted on said segmental support and operatively connected with said hoisting mechanism, a spring-held bell-crank pivoted on said controlling lever, said bell-crank having a shoulder normally engaging said support to lock the lever in place, a finger-piece pivoted on said controlling lever and operatively connected with said bell-crank to release said lever trom said support, a series of selective stops operatively connected with said bell-crank, a corresponding series of spring-held hand-levers operatively con-' nected with saidselective stops and adapted to draw said stops into the path of said pivoted cage projection, and a pivot-ally fixed stop in the path of said fixed cage projection by means of which the extreme motion of the cage is limited.

In testimony whereof I afiix my signature in presence of two witnesses.

CHARLES A.- STURM.

Witnesses:

KATE F. DARK, K. F. DOUGHTY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

